The Doublet III Neutral Beam Injector Cryosystem
Plasma heating experiments using neutral beam injection into the Doublet III tokamak have been underway since September 1981. Cryopanels employed in the beamline vacuum pumping system are force flow cooled to 3.8 K by a closed loop refrigeration system. Evaluation of the first beamline was carried out using a 25 L/h liquefier and a unique reliquefaction heat exchanger to permit subatmospheric operation and panel flow rates of 140 L/h.1 The system was upgraded for three beamline operation by substitution of a 100 L/h liquefier and more cryogen storage capacity. The system in its present configuration on Doublet III is described and its characteristics and operational history are discussed.
KeywordsCage Helium Charcoal Azimuth Liquefaction
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- (2).J. Tanabe, R. Yamamoto, and P. Van der Arend, “The Dili Neutral Beam Source Cryopanel System” National Tech. Info Service Conf-790327–98 (also LBL Report No LBL-8900, 1979).Google Scholar